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https://gitee.com/ge-yafang/docs/pulls/23123由 yaochaonan 提交于
Add description in timer doc Issue:https://gitee.com/openharmony/docs/issues/I7UE1H?from=project-issueSigned-off-by: Nyaochaonan <yaochaonan@huawei.com> Change-Id: Ib3531be6fed9018073534e05a13d41a0e186719f
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